class_docstr: A graph consists of connected Blocks, or Heads.
  
  # Arguments
      inputs: A list of input node(s) for the Graph.
      outputs: A list of output node(s) for the Graph.
code: def set_fit_args(self, validation_split, epochs=None):
      self.epochs = epochs
      # Epochs not specified by the user
      if self.epochs is None:
          self.epochs = 1
      # num_samples from analysers are before split
      self.num_samples = self.inputs[0].num_samples * (
          1 - validation_split
      )
  
imports: import keras_tuner
  from tensorflow import keras
  from tensorflow import nest
  from autokeras import blocks
  from autokeras import keras_layers
  from autokeras import nodes
  from autokeras.engine import head
  from autokeras.engine import serializable
  from autokeras.utils import io_utils
label_desc: Use image node_id 15 for calling the Graph obj's underlying member method code with example usage: obj.set_fit_args(validation_split, epochs) without return types